Pattern stripper for foundry plants



Jan; 2, 1945 5.1-1. WHITTAKER 2,366,582

7 PATTERN STRIPPERS FOR FOUNDRY PLANTS Original FiledJuly 9, 1941 2 mg v225 FIG. 2.

i INVENTOR.

7 Edward. H.WhifiELkEP Patented Jan. 2, 1945 I UNITED STATES PATENT OFFICE I PATTERN srmrra ifoii romnnrrmms l Edward H. Whittaker, Jersey City, N. J.

Original application July 9, 1941, Serial No.'

401,651. Divided and this application March 3,

1943, Serial No. 477,872

I topaz- 49) b b 3 Claims. This invention relates to foundry plants and .more particularly to a combined pattern carrier,

flask centerer and pattern stripper; I It is a division of. an application for United States patent on foundryplants, filed by meJdly 9, 1941, Serial Number 401,651, which-"has matured into Patent No. 2,338,153. I

.An important, object of .the invention is to provide an apparatus of this kind which will correctly center the flask with a minimum of effort on' the part of workmen and strip the-pattern expeditiously and cleanly.

Another important object is to provide, in foundry plant equipment, a combined guide means for the bed plate of a pattern stripper, as well as a support means fora flask and mold fromwhich the pattern has been stripped. 1

I Still another important object is to provide foundry plant equipment adapted to automatically both lower a pattern, and support the flask containing the pattern-stripped mold, above and wholly clear of the pattern.

Yet another important object is to provide a 'novel pattern stripper, free of side sway and not subject to undesirable vibrations.

Other objects and advantages of this invention will be apparent in the following detailed description of the invention, taken in connection with the accompanying drawing, forming a part of this specification, and in which drawing:

Figure 1 is a vertical longitudinal section of the novel combined apparatus.

Figure 2 is a view, partly in elevation and partly in vertical transverse section, of the same.

Figure 3 is a fragmentary elevation and sec-, tion of combined guide and support means of the new apparatus.

Figure 4 is a section of a valve employed in I conjunction with the apparatus.

In the accompanying drawing, wherein for the bodiment of the invention and wherein similar reference characters designate corresponding parts thruout the several views.

, The letter A may designate the new combined pattern carrier, flask centerer and pattern stripper, the letter B a flask, C a pattern, D a mold, E, a molding machine, and F conveyor roller bed. The apparatus A includes a bed plate [0 for detachably supporting a flask B and pattern'C, a jack II for supporting, lowering and, raising the bed plate I0, means I2 for operating the jack I I and combined guide and support means l3 for the bed plate Ill and flask B, when the jack II isoperatedby the means I2 to lower the pattern Cfromthe memo.

In the example shown, the I jack II comprises a cylinder I 4, a piston I5 therein, and a piston rod l6 extending upwardly thru the chamber I! in the cylinder I4 and thru an upper head I8 of thecylinder l4. I

The bed plate It! is detachably secured to the upper portion of piston rod I6 in any suitable manner and, in the example shown, has a cavity l9 open at its upper face for the pattern 0. This I plate I0 and the flask B may be provided with frusto-conical guide pins 20 and 21 for entrance into correspondingly-shapedcavities Hand 23, respectively, as shown in Figure l to correctly dispose the flask B relative to the pattern C. In addition, the plate I 0. may have upwardly and outwardly directed, longitudinally extending flanges, 24 for engagement with the outer longitudinal ,faces of the flask B to assist in properly positioning the flask on the bed plate I0. v Combined guide and support means l3is provided to operate when the flask projects beyond the end margins of the bed plate II). It includes standards 25secured to a suitable floor or sup port 26 and positioned beneath the four corners of the flask B, clear of the ends of the bed plates. It also includes sleeves 21 slidable on the standards 25 and preferably secured to the under side of the bed plate I0 adjacent the corners of the same, as by arms 28. From Figures 1 and 2 it will be clearly seen that thestandards 25 are inwardly of the vertical plane of the flask B and outwardly of the vertical planes of the inner faces 29 of its outer walls.

While, in the example shown, the means I3 is intended to function where the flask extends beyond the margins of the bed plate I0, it is obvious that different sized bed plates may be mounted on the jack II, to accommodate the particular mold to be made and that the standards 25 may, extend thru suitable holes in the bed plate, should the flasks B not extend beyond themargins of the bed plate.

Suitable rests or bumpers 30, preferably provided with resilient means, such as rubber pads, may be supported beneath the bedplate IE], on which the latter may settle when stripping the mold. Downwardly extending lugs 3| may be carried by the bed plate II] aligned with and adapted to contact the resilient bumpers 40.

The means l2 for operatingthe jack. II may include a three-way valve 35, a pipe3fi to a suitable supply of air under pressure, pipes 31 and 38 between the valve and the upper and lower portions, respectively, of the chamber H, the valve having an operating handle 39 and an exhaust port 40.

As is shown in Figure 4, air will enter that portion of the chamber I'I above the piston I5 and will exhaust from the portion of the chamber below the piston.

When the jack II is in the positions shown in the drawing, the flask B is free of en agement with the upper ends of the standards 25. As, the jack is lowered, the flask B will follow and come to rest with its outer walls disposed on the free ends of the standards, and the continued descent of the bed plate l will carry the pattern C with it, and will strip the mold D' and flask B free of the pattern.

The molding machine E may be of any approved construction but, preferably, one described and illustrated in my co-pending divisionel application for United States Patent on molding machines, filed by me July 9, 1941, Serial Number 401,651. This novel molding machine is provided with an upper stationary section 45 and a lower movable section 46 telescoping with the section 45, whereby the section 46 may be raised or lowered.

Upon raising of the section 46 there will be ample room to lift the flask B and mold D from the standards 25.

The conveyor roller bed F, disposed adjacent the apparatus A, is adapted for receiving such lifted flasks B and molds D, in order to pair with a companion flask and mold, and mounting them on a bottom board 50, disposed upon the rollers of the bed F, where they may be rolled to the next station of the foundry plant.

Not only do the standards and their sleeves 21 guide the upward and downward movement of the bed plate and eliminate side sway and any tipping of the bed plate, but the standards 25 have the dual function of providing four-point support for the flask as the bed plate descends.

I claim:

1. In a pattern stripper, means for supporting a flask, mold and pattern, including a bed plate; means supporting the bed plate for vertical reciprocation and means with the triple functions of engaging the flask as the second means lowers the bed plate, of supporting the flask elevated, and of guiding the bed plate in its reciprocation, comprising rigid standards disposed below the flask, and spaced from said bed plate at all times, with their upper ends normally spaced from said flask when said bed plate is in its highest position, and engaging the bottom of the flask as said bed plate is lowered, a support, means fixedly securing said standards to said support, and sleeves about the standards, slidable therealong, and secured to the bed plate.

2. In a pattern stripper, means for supporting a flask, said flask being provided with a guide pin socket in its under face, including a substantially flat bed plate provided with a guide pin accommodated in said socket; with upwardly extending side flanges and being free of end flanges, whereby said flask may lie upon said bed plate with said guide pin in said socket, said side flanges in contact with said flask, and the ends of said flask overhanging said bed plate; means supporting and vertically reciprocating the bed plate; and stationary means engaging said flaskat said overhanging ends, as the second means lowers the bed plate, and for supporting the flask elevated above the lowered bed plate.

3. In a pattern stripper for -a flask and mold, an open-ended substantially flat bed plate having upstanding side flanges whereby said flask may be disposed upon said bed plate with its side walls in contact with said flanges and its ends overhanging said bed plate; means supporting said bed plate for vertical reciprocation; and stationary means engaging said flask at said overhang-' ing ends, as said first means lowers the bed plate, and for supporting the flask elevated above the lowered bed plate.

EDWARD H. WHITTAKER. 

